Ims Services and Its Factors

Contents
 Background and Research Problems  What is IMS
A scenario supported by IMS Main advantages to network and users

Session control in IMS
IMS-level Registration
Registration Procedure Authentication flows during registration

IP Multimedia Subsystem (IMS)
Jun Lei Prof. Dr. Dieter Hogrefe
Telematics group University of Goettingen, Germany

Basic Session Setup
IMS session establishment call flow IMS INVITE procedure

 Session Initiation Protocol (SIP)  General IMS Architecture
Basic Architecture of the IMS

 IMS-related Entities and Functionalities
Session control and routing family: CSCF User data related: HSS , SLF Service related: AS , MRFC, MRFP Interworking elements: BGCF, MGCF, IM-MGW, SGW, Support entities: THIG, SEG, PDF IMS Charging Architecture

IMS Enabled Services Conclusions and topics for future studies References

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What is IMS?

Background and Research Problems
Users demand for multimedia services is rising, dialing & talking is a narrow subset of networking Until now network operators develop the services often lacking of new, innovate ideas based on using the traditional network capabilities Merging the Internet with the cellular worlds
 CS domain  PS domain  QoS, charging and integration of different services are not available for 3G users through the PS domain

A scenario supported by IMS
Anna
Call to Bob for business

Bob

Accept the call Activate the video mode

Answer
Initiate a push to talk group session

How can we provide end users new, exciting services to satisfy the subscribers’ demands
 IP multimedia subsystem is ideally placed to fill the gap  IMS is used to offer Internet services everywhere and at any time using cellular technologies

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What is IMS?

A scenario supported by IMS (Cont‘ d)
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